The word G. tuthli “match” appeared in the Gnomish Lexicon as elaboration of G. tuth “tinder” (GL/72).
Neo-Sindarin: This form does not adapt gracefully to later Sindarin, so for “match” I’d use ᴺS. tudheg as a diminutive form of ᴺS. tudh “tinder”.
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
tuth
noun. tinder
tuthli
noun. match
tuthlos
noun. a teazle
The word G. tuth “tinder” appeared in the Gnomish Lexicon as a derivative of the root ᴱ√tudh- [TUÐU] (GL/72), where the final ð became th.
Neo-Sindarin: I think this word may be salvaged in Neo-Sindarin as a derivative of the Neo-Root ᴺ√TUD “firewood, kindling”, but it would become ᴺS. tudh in Sindarin’s phonetic developments.